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Method for operating an internal combustion engine

a technology of internal combustion engine and operating method, which is applied in the direction of machines/engines, electrical control, output power, etc., can solve the problems of deterioration in the overall efficiency of the internal combustion engine, and achieve the effects of reducing the overall efficiency of the internal combustion engine, and reducing the opening duration of the gas exchange valv

Inactive Publication Date: 2006-10-05
DAIMLER AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to an internal combustion engine that can change operating modes between spark ignition and compression ignition modes. The invention addresses the issue of decreased efficiency in the engine when operating in the compression ignition mode due to the control times of the intake and exhaust valves. The invention reduces the opening duration of the gas exchange valves and maintains the opening times of the exhaust valves, which prevents high pressure loss and allows for sufficient time for exhaust-gas retention. The invention also takes into account the kinematics of the valve mechanism and ensures effective compression and high charge exchange efficiency. The invention provides a solution for improving the performance and efficiency of the internal combustion engine in both spark ignition and compression ignition modes.

Problems solved by technology

This gives rise to a deterioration in the overall efficiency of the internal combustion engine, in particular if the internal combustion engine has a cam valve mechanism and the valve closure overlap is to be set using cam contours which are designed for operation of the engine in the spark ignition cycle.

Method used

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  • Method for operating an internal combustion engine
  • Method for operating an internal combustion engine
  • Method for operating an internal combustion engine

Examples

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Embodiment Construction

[0014]FIG. 1 shows a reciprocating-piston internal combustion engine 1, in each of whose cylinders 2 there is arranged a longitudinally movable reciprocating piston 3 which delimits a combustion chamber 4 that is closed off by a cylinder head 5 attached to the cylinder 2. A mix of fuel and combustion air is formed in the combustion chamber 4 and burnt in order to drive the reciprocating piston 3. At least one intake port 13 and an exhaust port 14 are formed in the cylinder head 5. Oxygen-rich fresh gas is supplied through the intake port 13, and the combustion exhaust gases are discharged from the combustion chamber through the exhaust port 14. Gas exchange valves 6, 7, which are driven by a valve operating mechanism 26 and, depending on the nature of the four-stroke method, cyclically open the intake port 13 and with regard to the exhaust valve 7 open the exhaust port 14, are provided for the purpose of controlling the charge exchange. To meter in the fuel required for combustion, ...

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Abstract

In an internal combustion engine, wherein a combustible fuel mix is formed in a combustion chamber of the engine by fuel and by fresh gas supplied through intake ports and combustion gases discharged through exhaust ports including intake and exhaust valves, respectively, which valves are actuated by a valve operating mechanism and a spark ignition operating mode is provided in part of the load range and an operating mode with compression ignition is provided in another part of the load range and, in the event of a change in the operating mode, the opening duration of the gas exchange valves is altered while the opening times of the exhaust valves are maintained.

Description

[0001] This is a Continuation-In-Part Application of International Application PCT / EP2004 / 010280 filed Sep. 15, 2004 and claiming the priority of German application 103 48 139.7 filed Oct. 16, 2003.BACKGROUND OF THE INVENTION [0002] The invention relates to a method for operating an internal combustion engine including cylinders with pistons delimiting combustion chambers to which fuel and fresh gas are supplied and from which combustion gases are discharged via controllable inlet and outlet valves. [0003] In a reciprocating-piston internal combustion engine, a combustion chamber, in which fuel is burnt, is delimited by a longitudinally movable piston in each cylinder. Oxygen-containing fresh gas for the combustion of fuel is supplied via intake ports of the cylinders, while the combustion exhaust gases are discharged via exhaust ports. The ports are controlled by intake valves and exhaust valves which are actuated by a valve operating mechanism to carry out the cyclic charge exchan...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02B17/00F02B5/00F02B1/12F02B11/02F02B69/00F02B69/02F02D13/02F02D41/30F02M25/07
CPCF02B1/12F02B11/02F02B69/00F02B69/02F02D13/023Y02T10/18F02D41/3035F02D41/3064F02D2041/001F02M25/0752Y02T10/128F02D13/0265F02M26/01Y02T10/12
Inventor BRACHERT, GOTZHERWEG, RUDIGERKANNING, KAIPFAU, MATTHIASSCHAFLEIN, JOCHENWEIMAN, HANS-JURGEN
Owner DAIMLER AG
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